RANSOM.MSIL.NEGOZI.THABOCAH
HEUR:Trojan-Ransom.MSIL.Gen.gen (KASPERSKY); Ransom:MSIL/Kelnoc.A (
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It encrypts files with specific file extensions. It drops files as ransom note.
TECHNICAL DETAILS
14340 bytes
EXE
No
03 Dec 2018
Drops files, Displays message/message boxes, Encrypts files
Arrival Details
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Ransomware drops and executes the following files:
- %Application Data%\delback.bat
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
It adds the following processes:
- vssadmin delete shadows /all /quiet
Dropping Routine
This Ransomware drops the following files:
- {Directory where malware is run}\disks.txt
- {Directory where malware is run}\log.txt
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .adi
- .adt
- .altr
- .arw
- .asm
- .asp
- .aspx
- .bat
- .css
- .csv
- .doc
- .docx
- .dwf
- .dwg
- .frm
- .html
- .jpeg
- .jpg
- .js
- .msg
- .odt
- .php
- .png
- .ppt
- .pptx
- .psd
- .qbo
- .qbw
- .rpt
- .sldprt
- .sql
- .sqlite
- .txt
- .xls
- .xlsx
- .xml
- sln
It appends the following extension to the file name of the encrypted files:
- .evil
It drops the following file(s) as ransom note:
- {Affected directory}\DECRYPT_YOUR_FILES.HTML
SOLUTION
9.850
14.770.05
24 Jan 2019
14.771.00
25 Jan 2019
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Identify and terminate files detected as RANSOM.MSIL.NEGOZI.THABOCAH
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Search and delete these files
- {Directory where malware is run}\disks.txt
- {Directory where malware is run}\log.txt
- {Affected Directory}\DECRYPT_YOUR_FILES.HTML
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM.MSIL.NEGOZI.THABOCAH. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:
Step 6
Restore encrypted files from backup.
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